[91.] Demonstration.

[92.] Remarks.

[93.] Problem IX.

[94.] Operation.

[95.] Demonstration.

[96.] Problem X.

[97.] Operation.

[98.] Demonstration.

[99.] Remarks.

[100.] Method II. 70. By the accidental Point of inclin’d Lines.

[101.] Operation.

[102.] Demonstration.

[103.] Method. III.

[104.] Operation.

[105.] Method IV.

[106.] Prob. XIV.

[107.] Example I.

[108.] Example II.

[109.] Conclusion.

[110.] CHAP. IV.

[111.] Problem I.

[112.] Example.

[113.] Problem II.

[114.] Operation.

[115.] Demonstration.

[116.] Proe. III.

[117.] Operation.

[118.] Demonstration.

[119.] Prob. IV.

[120.] CHAP. V.